Re: Power amplifier matching circuits?
- From: Joe McElvenney <ximac@xxxxxxxxxxxxxx>
- Date: Thu, 15 Dec 2005 00:48:57 +0000
Hi,
> I'd like to design a 10W VHF P.A., but all I've ever designed were
>some LNAs and other low powered amplifiers. So now for the dumb
>question: How do I know what matching circuit components to chose,
>since now I have to be concerned not only with the L and C circuit
>values themselves (to obtain a good power match), but also the highest
>voltage level that these components must survive at the output of the
>RF P.A. (so that the whole P.A. output circuit does not go up in
>smoke). How do I calculate what voltages that these components must be
>rated to, and select my P.A. passives accordingly?
Obviously the simple solution is to copy someone else's
design for the same frequency and power level from a journal or
handbook. But, should you wish to do it on your own, you will need
to read the literature and the name that immediately springs to
mind is Motorola. They have an excellent book by Dye and Granberg,
"Radio Frequency Transistors : Principles and Practical
Applications" that lays it all out and several application notes,
such as AN721 on matching, if you don't mind a little maths.
Cheers - Joe
.
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